Rotary pump



Feb 28 l933- o. s. SLEEPER ET AL 1,899,904

ROTARY PUMP Filed Dec. 20, 1929 2 Sheets-Sheet 2 Wvg/vra@ fdl/.V A, /J /l barren STATES PATENT oFFicE:

OLIVER STEELE SLEEPER AND CHARLES Il't WESTIN, OF PHILADELPHIA, PENNSYL- VANIA, ASSIGNOR-S TO F. J. STORES M ACHIN E COMPANY, 0F PHILADELPHIA, PENN- 4S'YI'JVAIIIA, A CORPORATION OF PENNSYLVANIA p ROTARY PUMP Application filed December 20, 1929. Serial No. 415,393.

Our invention relates to rotary pumps particularly to those having a piston of the rotating type.

More articularly, our invention consists in providing a flexible but gas-tight connection between the rotating piston and the slide valve which is attached thereto.

Other features of our invention consist in providing a pump having a support with an oil reservoir therein, a sump in the reservoir for the removal of water and impurities from the oil, a baffle in said reservoir in the path of the air or gas passing therethrough to remove oil or other impurities 'from the air, oil lines to the various parts 'of the pump to be lubricated, oil strain'ers in said lines, and a water jacket or coil lfor cooling the oil in said reservoir.

F or a more complete exposition of our invention reference may be had to the anneXed drawings and specification at the end whereof the invention will be specifically1 pointed out and claimed.

1n the drawings,

Figure 1 represents a vertical cross section through a pump embodying our invention.

Figure 2 represents a vertical cross section showing in greater detail the rotary piston and slide valve.

Referring to the drawings, there is shown a rotary pump having a hollow base 1 which contains an oil reservoir generally indicated as 20. A pump proper is formed by a cylinder 2 which is closed .at both ends and surrounded by a jacket 3 adapted to contain water or other cooling medium.

Mounted in cylinder 2 is a shaft 4 which is driven from any suitable source of power. Keyed or otherwise fastened to shaft 4 is eccentric 5 which carries on its outer Asurface' the rotary piston 6. A slide valve hinge 7 is fitted on a clamp or key 77 milled on one side of the rotary piston 6 or hinge 7 may be integral with piston 6 or fastened thereon in any convenient manner. This hinge is semi-cylindrical in shape and has one or more openings 8 passing through the central part thereof.

In one side of jacket 3 is slide valve i which may be circular or rectangular in cross section and which has one or more ports .10 therein. Through the lower end of the slide valve and through opening or openings 8 in hinge 7 pass one or more eyebolts 11 which are fastened to the rotary piston 6 by one or more pins 12 or by any other pivotal fastening. If desired bolts 11 may be tapped into or otherwise integrally fastened to piston 6. Eyebolts 11 carry at their outer end nuts 13 which serve to stress springs 14 against ball seats 15.

By means of hinge 7 and the cooperating curved end of slide valve 9, which is shaped to slide on hinge 7, and by means of/ball seat 15 and the cooperatin surface of/ slide valve 9, which is curved to t therewith, there is provided a flexible connection between the rotary piston 6 and the slide valve 9. This connection, though flexible, is at allhtimes gastight and prevents the leakage of air or gas Vout of or into the cylinder 2 and also prevents the leakage of air or gas from the chamber formed between the cylinder 2 and piston 6 on one side of the line or point of contact therebetween to the chamber formed between cylinder 2- and piston 6 on the other side of the line or point o'f contact. The cylinder 2 is also provided with port 16 which is provided with a valve 17 which may be of any spring tyfpe and with an inlet port 18 curved to inter t with hinge 7 and through which the slide valve 9 extends.

The cylinder 2, the jacket 3 and the parts cooperating therewith are supported by the hollow base 1 which has an oil reservoir therein generally indicated as 20. In the upper part of the hollow base there is formed an orifice 21 through which gas or air from the pump may escape to the atmosphere. Port 16v from' cylinder 2 also opens from cylinder 2 into the hollow base 1 to the air space formed above the oil in the reservoir. Between port 16 and orifice 21 are disposed one or more oil separators 22. These oil separators consist of batlles extending part way across the air space above the oil reservoir and beneath the oil level and having on their face nearest the outlet from the pump a plurality of vertically disposed ridges 23.

In the bottom of the oil reservoir 21 is formed a depressed chamber or sump 24 which is intended to collect water or other impurities from the oil. Pipe 25 is connected with the sump so that the addition of fresh oil to the reservoir 20 drives the impurities out through pipe 25. Pipe 25 is prvided with a goose-neck outlet at its outer en There is also provided means for cooling the oil in the reservoir 20. This is shown as consisting of a water jacket 26 which is connected by a pipe 27 with jacket 3. The Water circulates by entering chamber 26, ascending through pipe 27 to jacket 3, whence it is led off through the opening in the top of the jacket. This cooling means may also consist of a. water 'coil submerged in the oil in reservoir 20.

From oil reservoir 20 lead oil lines 28, of which only one is shown, extending to various parts of the pump. These oil lines are controlled by needle valves 29 and contain oil strainers 30.

Outside of base 1 there is provided an oil level gauge 31, also a water level gauge 32.

By the location of the oil reservoir beneath the pump the tendency of the pump to fill with oil upon stopping, is guarded against as the oil drains from the cylinder 2 into the reservoir 20. Because the pump is not filled with oil it is started morereadily and there is no danger of stalling the pump or of straining it due to its being filled with oil. Sufiicient oil for lubricating the pump is readily forced up by the air pressure on.

the reservoir 20 through pipes 28 to the pump parts which are at less than atmospheric pressure. The supply of oil to the center of the shaft 4 is, by means of a hole 35, drillel through eccentric 5 which permits the oil to fill up the cavity in- 6 and eliminates an air pocket. From this source the oil works out and lubricates the ends of 5 and 6, where they contact with the cylinder heads. The oil is introduced into 4, by having the journal in which the shaft 4 rotates blind at one end so that pipe 34, supplying the oil, is merely attached to the outer wall of this journal.

The improvement shown is intended to operate as a vacuum pump although it may be used'as a compression pump with merely incidental modification.

In the operation of our device, as a vacuum pump, shaft 4 is rotated from any suitable source of power which causes the point or line of contact between cylinder 2 and piston 6 to be rotated about the cylinder. As piston 6 moves, slide valve 9 is drawn therewith until port 10 opens a connection from apparatus to be evacuated through intake 33 into cylinder 2 behind the line of contact between piston 6 and cylinder 2. At the same time any air or gas in front oi the line of contact between piston 6 and cylinder 2 is expelled through port 16 against the pressure ot valve 17 which prevents the entrance of outside gas into the cylinder and, therefore, prevents unnecessary back pressure.

Gas discharged from port 16 passes through oil reservoir 20 above the level of the oil therein and escapes therefrom through orifice 21. Between port 16 and orifice 21 are located one or more baihes 22 which remove any entrained oil or impurities from the exhaust gas and also act as a muffler to prevent noise.

The foregoing is merely a preferred imrovement of our invention and we do not intend to be limited in the practice thereof lsave as the scope of the prior art and the attached claims may require.

We claim:

1. A rotary pump including a cylinder having inlet and outlet passages, a piston, a slide valve having rectilinear motion, a bolt mounted on a pivot on said piston and forming a pivotal connection between said piston and said slide valve, and a ball seat on said bolt providing for rotary movement between said valve and said bolt.

2. A rotary pum including a cylinder having inlet and out et passages, a piston, a slide valve having rectilinear motion, a hin e having a face intertting with said sli e valve, and a bolt mounted on a pivot on said piston and having relative rotary movement with said valve and forming a pivotal connection between said piston and said slide valve, said hinge being. located between said piston and said slide valve.

3. A rotary pump including a cylinder having a port therein, a piston, a slide valve having rectilinear motion and having ports therein, a hinge fitted in the port in said cylinder and interfitted with said slide valve, a bolt forming a pivotal connection between said slide valve and said piston, a nut on said bolt, a ball seat on said bolt interfitting with said slide valve, and a spring clamped between said nut and said ball seat.

4. A rotary pump having as elements thereof walls defining a cylindrical chamber with closed ends and having an inlet passage and an outlet passage leading therefrom, a. rotary piston mounted to rotate in said chamber and having curved walls cooperating with the curved walls of said chamber, a slide valve mounted in an opening in the wall of said chamber and having an orifice therein which is covered and uncovered by the Wall of said chamber as said valve reciprocates in response to the rotation of said piston` 4and a member slidably connected to said valve and pivotally mounted on said piston and mounted for relative rotary movement on said valve and forming a pivotal connection between them.

5. A rotary pump having as elements therey pivotally connected at one end to said piston and passing at its other end throu ,h a Wall of said valve, and a ball seat on sai bolt and having sliding, gas-tight engagement with said valve. y

6. A rotary pump having as elements thereof Walls defining a cylindrical chambeil with closed ends and having an inlet passage and an outlet passage leading therefrom, arotary piston mounted to rotate in said chamberand having cuived Walls cooperating with the curved walls of said chamber, aslide valve mounted in an .opening in the Wall of said chamber and having an orifice therein which is covered and uncovered by the Wall of said chamber as said valve reciprocates in re-y sponse to the rotation of said piston, a hinge having a face interitting with one face 'of said valve and interposed betweenl said valve and said piston, and a bolt slidably connected tion 1n' on'eof said passages, a hinge interat its ends to said valve and tosaid piston and forming a pivotal connectionwbetv'veen their holding said hinge therebetween.

7. A rotary pump having as elements thereof walls defining rcyli-ndrical chamber, with closed ends and having. `an inlet "pas-,f sage and an outlet passage leading""thereI from, a rotary piston mounted to rotate in said chamber'and having curved Wallsco` operating With the curved Walls of said cham- ;her, a slideivalve mounted in an opening in the wall of said chamber and having an orifice therein which is covered and uncovered by the Wall of saidcliamber as said valve reciprocates in response to the rotation of said piston, a hinge lhaving a face interfitting with one face of said valve and interposed between said valve and said piston, a bolt pivotally connected at one endto said piston and passing at its other end through said hinge and one wall of said valve, a ball seat on said bolt having sliding, gas-tight connection ywith said valve, a nut on the opposite end of said holt from said piston, and a spring encircling said bolt and interposed between said nut and said ball seat. c

8. A rotary pump having as' elements thereof Walls definingl a cylindrical chamber having closed ends and having inlet and outlet passages connected thereto, a rotary piston mounted iii said chamber and havingr curved walls cooperating `with the curved walls of said chamberH a slide valve mounted in said inlet passage and having an opening reservoir.

therein which is covered and uncovered by the Wall of said chamber as the valve reciprocates, a flexible, gas-tight connection pivotally fastened at one portion to said piston and slidably fastened at another portion to said valve, a base on which said chamber is mounted, an oil reservoir in said base, asump in said reservoir, and an oli-flow' pipe for separating Water from the oil leading ott' from the bottom of the sump having lits outlet end at the normal level of the oil in sa-id- 9. A rotary pum including a' cylinder' with closed ends an having inlet-and outlet passages thereto, a shaft rotatably mounted in said cylinder and having an oil inlet passage therethrough, an eccentric fastened on said shaft and having a-"hollow chamber therein and an oil passage aligned with the oil passagev in said shaft, a piston mounted .on said eccentric and having a hollowchamber thereinwith which the said oily passages communicate,` a slide valve mounted for reciprocating motion in said inlet passage, and a gas-tight 'connecting member having rotatable connection with said piston and with 'said valve.. l l

10. A rotary pump including a cylinder havingl inlet 'and outlet passages thereto, a piston mounted for rotation in said cylinder, aslide valve having reciprocating mopose'dbetweensaid piston and said slide valve Tland' formingan interfitting gas-tight joint theiebetweem and means forming a pivotal connection connectingv said valve to said pistoirfand connected for rotary movement to both said valve and said piston.

Il .jfA rotary pump including a cylinder having inlet and outlet passages thereto, a" l piston mounted for rotation in said cylinder, afslide valve having reciprocating movement in one ,ofsaid passages, and means forming a gas-tight joint-between said piston andsa'id valve and connected for rotary movement `'to both.- said valve andsaid piston. '12'. A rotary `ump including a cylinder having inlet andloutlet passages thereto,l a piston in said -cylinder, a slide valve having` rectilinear motion in one of said passages7 and a bolt mounted on a pivotoii said piston and having rotary movement relative to said valve forming a pivotal connection between said valve and said piston.

OLIVER STEELE SLEEPEH.

CHARLES J. WESF. 

